Head Unit Wiring

Unregistered. · 22-08-2009 9:14pm #1

I bought a new JVC head unit to go into my Seat Leon. Everything is working fine except there is no sound

.

Any ideas??

NOTE: Tried swappping red cable with yellow and still no sound!

Gary ITR · 22-08-2009 9:16pm

Unregistered. wrote: »

Everything is working fine except there is no sound .

Ah now how can everything be fine then?

So it's getting power but no sound? Have you gone through all of the settings on the HU?

EasyFold · 22-08-2009 10:29pm

Model number of the HU will help...

On some other makes the yellow is only the remote (switch) for additional components like amps, eq's etc..

Are you using the radio high power outputs directly onto speakers or are you going through a amplifier?

Unregistered. wrote: »

I bought a new JVC head unit to go into my Seat Leon. Everything is working fine except there is no sound .

Any ideas??

NOTE: Tried swappping red cable with yellow and still no sound!

stevenmu · 22-08-2009 10:43pm

What connectors did you connect to it? There should be two ISO connectors, a black and a brown one usually, they both need to be connected.

Unregistered. · 23-08-2009 1:32am

Onkle wrote: »

So it's getting power but no sound? Have you gone through all of the settings on the HU?

Yes.

EasyFold wrote: »

Model number of the HU will help...

The Model number is KD-R301 . http://jvcmobile.co.uk/product.php?pr=169

EasyFold wrote: »

Are you using the radio high power outputs directly onto speakers or are you going through a amplifier?

Directly to the speakers. There is no aftermarket parts installed except for this new headunit.

stevenmu wrote: »

What connectors did you connect to it? There should be two ISO connectors, a black and a brown one usually, they both need to be connected.

Both are connected.

DUBLINHITMAN · 23-08-2009 2:21am

this is for the ibiza but i reakon it could help with your leon
http://www.seatcupra.net/forums/showthread.php?t=107740&highlight=stereo+mk2+ibiza
http://www.nexxia.co.uk/car_stereo_fitting_kits/images/PC2-75-4.jpg
best of luck have you got a multimetre??

Unregistered. · 23-08-2009 11:58am

DUBLINHITMAN wrote: »

this is for the ibiza but i reakon it could help with your leon
http://www.seatcupra.net/forums/showthread.php?t=107740&highlight=stereo+mk2+ibiza
http://www.nexxia.co.uk/car_stereo_fitting_kits/images/PC2-75-4.jpg
best of luck have you got a multimetre??

Yeah I've looked up seatcupra.net already, the common issue with replacing a head unit in Seats is that they often forget the time and FM presets when the engine tunrs off, which is why Red and Yellow need to be swpped over. The instruction set for the JVC headunit also states that this may be required.

Unregistered. · 24-08-2009 10:41am

*bump*

seataltea · 24-08-2009 11:43am

Hey OP, what year is your Leon? Is it the new model or the old model?

Unregistered. · 24-08-2009 12:27pm

seataltea wrote: »

Hey OP, what year is your Leon? Is it the new model or the old model?

Old model, mk1!

Bluefoam · 24-08-2009 12:52pm

Is yellow not the mute?

Unregistered. · 24-08-2009 1:17pm

Bluefoam wrote: »

Is yellow not the mute?

It would be gas if it was, and that's why there was no sound!

Unregistered. · 27-08-2009 11:44am

ANy other thoughts, anyone?

Unregistered. · 28-08-2009 10:53am

How do I go about checkin if it's the speakers, or a short ciruit??

zuutroy · 28-08-2009 11:03am

Yellow is normally continuous 12V iirc. If everything is connected via ISO then its pretty hard to make a mess of it. If there's power to the unit etc. then its possible the unit has a dud amp. Has happened to me before.

Unregistered. · 28-08-2009 11:24am

zuutroy wrote: »

Yellow is normally continuous 12V iirc. If everything is connected via ISO then its pretty hard to make a mess of it. If there's power to the unit etc. then its possible the unit has a dud amp. Has happened to me before.

Here is what I'm tlking about when I swapped the yello and the red. Also, I've tried every configuration on this page, they all don't seem to work!

leex · 28-08-2009 11:30am

If you put a cd into it - does it appear to play?

zuutroy · 28-08-2009 11:38am

Does the power behave as it should, ie continuous 12V keeping your stations and time when the car is off and powering the unit when the key is turned to ACC? If so then you're wasting your time as that diagram has nothing to do with getting sound from it.

Unregistered. · 28-08-2009 11:57am

zuutroy wrote: »

Does the power behave as it should, ie continuous 12V keeping your stations and time when the car is off and powering the unit when the key is turned to ACC? If so then you're wasting your time as that diagram has nothing to do with getting sound from it.

Yes, I am aware of that.

Unregistered. · 28-08-2009 12:00pm

leex wrote: »

If you put a cd into it - does it appear to play?

Yup, it seems like everything is working fine. Lights up. Tuner is working, CD player spins, just no sound!

zuutroy · 28-08-2009 12:15pm

I'd be fairly sure the amp is busto.

Unregistered. · 28-08-2009 12:38pm

zuutroy wrote: »

I'd be fairly sure the amp is busto.

In the HU?

zuutroy · 28-08-2009 1:00pm

Yup. Did you retry the factory stereo since? If it works, then by process of elimination that all it can be.

Unregistered. · 28-08-2009 1:26pm

zuutroy wrote: »

Yup. Did you retry the factory stereo since? If it works, then by process of elimination that all it can be.

Well that's why i got the new HU in the first place, tI had no sound from the speakers!

zuutroy · 28-08-2009 1:29pm

Oh well can that suggestion so!

DUBLINHITMAN · 28-08-2009 3:04pm

so its the speakers then ??
afaik the back speakers are easiest to get to so check the wires aren't out of the speakers
if there still in the sockets then replace the speakers

Unregistered. · 28-08-2009 4:24pm

DUBLINHITMAN wrote: »

so its the speakers then ??
afaik the back speakers are easiest to get to so check the wires aren't out of the speakers
if there still in the sockets then replace the speakers

Yeah, I have a mulitmeter, can i check the current at the ISO connection form the car's wiring loom, or will i have to test each speaker?

zuutroy · 28-08-2009 4:30pm

Test each speaker wire coming from the back of the ISO. Each wire should have a few hundred mA flowing through it when there the head unit is outputting something. Each speaker is on its on loop so there's no reason why all 4 should die at once.

Unregistered. · 28-08-2009 4:33pm

zuutroy wrote: »

Test each speaker wire coming from the back of the ISO. Each wire should have a few hundred mA flowing through it when there the head unit is outputting something. Each speaker is on its on loop so there's no reason why all 4 should die at once.

A short somewhere, maybe?

zuutroy · 28-08-2009 4:35pm

But if there was a short it would only affect one speaker as they're on 4 different circuits.

Unregistered. · 28-08-2009 4:39pm

zuutroy wrote: »

But if there was a short it would only affect one speaker as they're on 4 different circuits.

across all four i mean?

zuutroy · 28-08-2009 4:52pm

I don't see how thats possible. If you look at the diagram, there's no wire that could be shorted which would affect all 4 speakers

Unregistered. · 28-08-2009 5:06pm

zuutroy wrote: »

I don't see how thats possible. If you look at the diagram, there's no wire that could be shorted which would affect all 4 speakers

Right hmmm..... So I should have some sound, from somewhere! How could i have bough a new HU with a dodgy amp? Assuming the amp is fine in the new one, and the speakers are fine, what else could it be?

Head Unit Wiring

Comments